Abstract
Mesoporous MgAl(O) sorbents with different Mg/Al molar ratios (0, 0.5, 1.0, 1.5) were synthesized via a one-step surfactant assisted precipitation method. The structural properties of these sorbents were systematically characterized by XRD, SEM, FT-IR, N2 adsorption–desorption and CO2-TPD. The CO2 adsorption–desorption performance of the sample was studied in a fixed-bed reactor. The results showed that the xMgAl(O) sorbents possessed a mesoporous structure, high specific surface areas and abundant basic sites. In the synthesis process, Mg and Al species interacted with P123 to form PEO-Mn+-anions that promoted the dispersion of MgO on the Al2O3. The XRD, FT-IR and CO2-TPD results showed that the MgO was not only dispersed on Al2O3, but enters the Al2O3 framework, resulting in more exposed basic sites for CO2 adsorption. In the CO2 adsorption process, the CO2 adsorption capacity of the sorbent was related to the amount of basic sites and the specific surface area. The CO2 uptake of the sorbent significantly improved in the presence of water vapor. Results of a cycling test suggested that the sorbent was stable in multiple adsorption–desorption cycles.
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